Economical surgical lighting device and method of assembly

A surgical lighting device comprising:

• a shell, and a plurality of light sources coupled to the shell,
• the device further comprising a closure plate which is at least partially transparent to light and which is coupled to the shell to close off an internal area of the surgical lighting device, the closure plate being configured for passing light from the light sources,
• the closure plate comprising a plurality of lens elements, each lens element comprising a Fresnel lens, the Fresnel lenses each comprising a series of raised teeth concentrically disposed on an interior surface of the closure plate, each lens element being configured to collect and focus light from at least one light source to generate an illumination spot of a predetermined diameter located at a predetermined distance from the lighting device,
• the light sources and the closure plate being arranged such that light from the light sources and received by associated lens elements impinge on the lens elements substantially without prior reflection or deflection, the device being free of optical elements between the light sources and the closure plate,
• wherein the closure plate comprises at least one base plate having an outer face that corresponds to the light exit surface of the closure plate and an inner face with at least one lens element attached to the inner face of the base plate, and
• wherein the closure plate comprises at least one optical plate disposed between the lens elements and the base plate for diffusing and/or filtering light.